scoreboard.py

import pygame.font
from pygame.sprite import Group

from ship import Ship


class Scoreboard:
    """显示得分信息的类"""

    def __init__(self, ai_game):
        """初始化涉及得分的属性"""
        self.ai_game = ai_game
        self.screen = ai_game.screen
        self.screen_rect = self.screen.get_rect()
        self.settings = ai_game.settings
        self.stats = ai_game.stats

        """显示得分信息时使用的字体设置"""
        self.text_color = (30, 30, 30)
        self.font = pygame.font.SysFont(None, 48)

        """准备包含最高得分和当前得分的图像"""
        self.prep_score()
        self.prep_high_score()

        """显示当前等级"""
        self.prep_level()

        """显示剩余飞船"""
        self.prep_ships()

    def prep_score(self):
        """将得分渲染为一幅图像"""
        rounded_score = round(self.stats.score, -1)  # round使得小数精确到某一位，位数由参数的数字表示（此处为-1），若为负数，则舍入到10的整数倍
        score_str = "{:,}".format(rounded_score)  # 将得分数值转化为字符串  # 将数值转化为字符串时增加逗号，变为1，000，000
        self.score_image = self.font.render(score_str, True,
                                            self.text_color, self.settings.bg_color)  # 将字符串创建为图像

        """在屏幕右上角显示得分"""
        self.score_rect = self.score_image.get_rect()  # 得分锚定在屏幕右边，并和屏幕右边缘保持20像素，得分变大后就会向左延伸
        self.score_rect.right = self.screen_rect.right - 20
        self.score_rect.top = 20    # 和屏幕上边缘相距20像素

    def prep_high_score(self):
        """将最高得分渲染为图像"""
        high_score = round(self.stats.high_score, -1)
        high_score_str = "{:,}".format(high_score)
        self.high_score_image = self.font.render(high_score_str, True,
                                                 self.text_color, self.settings.bg_color)

        """最高得分显示在屏幕顶部中央"""
        self.high_score_rect = self.high_score_image.get_rect()
        self.high_score_rect.centerx = self.screen_rect.centerx
        self.high_score_rect.top = self.score_rect.top

    def prep_level(self):
        """将等级渲染为图像"""
        level_str = str(self.stats.level)
        self.level_image = self.font.render(level_str, True,
                                            self.text_color, self.settings.bg_color)

        """等级显示在得分下方"""
        self.level_rect = self.level_image.get_rect()
        self.level_rect.right = self.score_rect.right
        self.level_rect.top = self.score_rect.bottom + 10

    def prep_ships(self):
        """显示剩余飞船数量"""
        self.ships = Group()
        for ship_number in range(self.stats.ships_left):  # 根据剩余数量进行循环，在循环中创建飞船新实例
            ship = Ship(self.ai_game)
            ship.rect.x = 10 + ship_number * ship.rect.width
            ship.rect.y = 10
            self.ships.add(ship)

    def check_high_score(self):
        """检查是否产生了最高得分"""
        if self.stats.score > self.stats.high_score:  # 有新的最高得分就更新
            self.stats.high_score = self.stats.score
            self.prep_high_score()

    def show_score(self):
        """在屏幕上显示最高得分和当前得分，还有等级，以及剩余飞船数量"""
        self.screen.blit(self.score_image, self.score_rect)
        self.screen.blit(self.high_score_image, self.high_score_rect)
        self.screen.blit(self.level_image, self.level_rect)
        self.ships.draw(self.screen)